thulium

element 69

Thulium

chemical element with symbol Tm and atomic number 69

Thulium sublimed dendritic and 1cm3 cube.jpg

Tm

Chemical element with atomic number 69 (Tm)

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Thulium is a chemical element; it has symbol Tm and atomic number 69. It is the thirteenth element in the lanthanide series of metals. It is the second-least abundant lanthanide in the Earth's crust, after radioactively unstable promethium. It is an easily workable metal with a bright silvery-gray luster. It is fairly soft and slowly tarnishes in air. Despite its high price and rarity, thulium is used as a dopant in solid-state lasers. It has no significant biological role and is not particularly toxic. Artificial radioactive isotopes of thulium are used as radiation sources in some portable X-ray devices.

en

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Thulium

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